Cardboard QR Scanning without Unity SDK

I've been trying to figure out how to scan and use the QR codes provided with Cardboard devices without needing to use the Unity API. I've already written SCN-VR for SceneKit based VR for iOS devices with Obj-c and I would want scanning QR codes to also work to make setting up profiles simpler.

I've seen a QR code scan to goo.gl/pdNRON, which leads to a page on how to download the Google Cardboard app, but what HTTP service is the Google Cardboard app going to download the actual profile?

The protocol buffer definition file is available at https://github.com/google/wwgc/blob/master/www/CardboardDevice.proto. Once you have the Protocol Buffers compiler built (protoc, from the tutorial link above), just run it on CardboardDevice.proto, and include the output .cc and .h files in your project. You can access the info through the DeviceParams type, after sending the decoded data to it.